Experimental investigation of formability of commingled woven composite preform in stamping operation

Influence of the tufting yarns on formability of tufted 3-Dimensional composite reinforcement

“…The formability behaviours depend on the process parameters (punch shape, blank-holder pressure, initial orientation of reinforcement, etc.). On the other hand, the forming defects (wrinkling [5][6][7][8][9][14][15][16][17], buckling [20,21], unweaving or loss of cohesion [5,22], etc.) will be related to the formability behaviours.…”

“…The forming defects are not acceptable for the deformed preform and consequently for the final composite part. Also, the studies [5][6][7][8][9][10][11][12][13] indicate that all reinforcements used do not have the same capacities of deformability. The determination of mechanical behaviours of the reinforcements (in-plane shear [23][24][25][26], bending [27][28][29] and tensile [30,31]) is essential and complementary to the preforming tests.…”

“…Several experimental [5][6][7][8][9][10][11][12][13] and numerical [13][14][15][16][17][18][19] studies exist concerning the draping stage of dry reinforcement. The first step of RTM process, is carried out to understand the deformability of preform on more and more complex shapes (given by punch and die).…”

“…The first step of RTM process, is carried out to understand the deformability of preform on more and more complex shapes (given by punch and die). The work shown in [5][6][7][8][9][10][11][12][13] describes the measurement criteria that can qualify the reinforcement formability behaviours such as intraply shearing, material draw-in, load, fibre orientations, and homogeneity of the fibre density. The formability behaviours depend on the process parameters (punch shape, blank-holder pressure, initial orientation of reinforcement, etc.).…”

Induced forming modes in a pre-consolidated woven polypropylene composite during stretch forming process at room temperature: I. Experimental studies

“…Benefitting from composites in a broader range of applications is viable only if they are produced via a more effective technique capable of addressing high volume production rates. Stamp forming, as a rapid manufacturing technique, has been extensively applied and studied on prepreg woven composites [7][8][9][10][11][12][13][14][15][16]. The procedure includes forming of already impregnated woven fabrics into the desired geometry by a punch (draping) http whilst sufficient pressure and temperature is applied.…”